3 INFORMATION FOR TYPE APPROVAL
If the device is exposed to mechanical vibration with an acceleration of 1 m/s
2
perpendicular to the mem-
brane plane of the microphone, the lower limit of the linear operating range increases to 75 dB for the
frequencies 31,5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 630 Hz, 800 Hz and 1000 Hz, frequency weighting A.
If the device is exposed to mechanical vibration with an acceleration of 1 m/s
2
parallel to the membrane
plane of the microphone, the lower limit of the linear operating range increases to 58 dB for the frequencies
31,5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 630 Hz, 800 Hz and 1000 Hz, frequency weighting A.
3.5 Self-generated noise
In a sound field with an insignificant contribution to the inherent noise, levels of L
AF
< 14 dB as well as
L
CF
< 16 dB are to be expected.
The electrical noise inherent in the preamplifier (terminated with spare capacity and 50Ω at the input) will
produce L
AF max
< 14 dB as well as L
CF max
< 20 dB in the display device.
3.6 Linear operating ranges
The operating ranges given below are only valid for calibrated devices! The starting value for each level
linearity test is 94 dB at 1 kHz.
Frequency max in dB(A) min in dB(A) Range in dB(A)
31,5 Hz 100 25 75
1 kHz 140 25 115
4 kHz 140 27 113
8 kHz 139 27 112
12,5 kHz 135 27 108
Table 3.9: Linear operating ranges A-weighted
Frequency max in dB(C) min in dB(C) Range in dB(C)
31,5 Hz 137 62 75
1 kHz 140 30 110
4 kHz 138 30 108
8 kHz 137 30 107
12,5 kHz 133 30 103
Table 3.10: Linear operating ranges C-weighted
3.6.1 Level linearity range
The following table 3.11 contains the measurement ranges for A-weighted sound levels and the C-weighted
peak sound level for microphone sensitivity of 50 mV/Pa.
Fast/Slow/Leq in dB(A) L
AE
in dB(A) L
Cpeak
in dB(C)
25. . . 140 ab 25 37. . . 143
Table 3.11: Level linearity ranges for A-weighted sound levels and C peak
Manual Tango_Plus 40 of 47 SINUS Messtechnik GmbH
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